Combined changeover and control valve

摘要

A slim profile rotary control valve capable of independently modulating fluids into a single heat exchanger from two different and distinct systems that utilize the same type of heat transfer fluid. The valve is capable of monitoring both the supply and return fluid temperatures as well as the mass flow to enable the valve controller to optimize system's energy efficiency. It eliminates the use of multiple valves currently used in a conventional changeover system and automated control of valve positioning works much superior to existing valves. The housing and inner cylinder have tapered profiles to enable rotary sealing between the inlet and outlet ports. The housing has flow characterization profiles machined into the outlet ports thus eliminating the need for characterization disks. The rotary valve has a geometry that allows for a no flow dead zone when no heat exchange is so demanded.

主权项

1. A dual chamber rotary valve comprising:
a valve housing having a stopped internal bore with a bore bottom face and an open top, said bore narrowing in taper from said top to said bottom face; a top plate that is mechanically affixed to said valve housing so as to extend over said open top, said top plate having a valve stem orifice formed there through; a tapered valve cylinder matingly configured to and rotatably housed within said internal bore, said valve cylinder having a valve stem extending normally there from a cylinder top that protrudes through said valve stem orifice adapted for rotating said valve cylinder within said valve housing: a circular, internal central plate in said valve cylinder, dividing said valve cylinder into an upper chamber and a lower chamber, said valve chambers simultaneously operated and not in direct fluid communication with each other and said central plate having a top surface and a bottom surface; a supply crossover port formed in said upper chamber; a supply slotted port formed in said upper chamber; a return crossover port formed in said lower chamber; a return slotted port formed in said lower chamber; a first temperature fluid supply port in said valve housing; a second temperature fluid supply port in said valve housing; a heat exchanger valve supply port in said valve housing; a first temperature fluid return port in said valve housing; a second temperature fluid return port in said valve housing; and a heat exchanger valve return port in said valve housing wherein said supply crossover port, said supply slotted port, said first temperature fluid supply port, said second temperature fluid supply port and said heat exchanger valve supply port all have midpoints that align about a first common plane that bisects said first valve chamber and resides parallel to said central plate; and wherein said return crossover port, said return slotted port, said first temperature fluid return port, said second temperature fluid return port and said heat exchanger valve return port all have midpoints that align about a second common plane that bisects said first valve chamber and resides parallel to said central plate; wherein there is always complete operational alignment between said supply slotted port and said heat exchanger valve supply port, simultaneous with complete operational alignment between said return slotted port and said heat exchanger valve return port.